Heating and ventilating apparatus



(No Model.)

E. 0.- BURROWS. HEATING AND VENTILATING APPARATUS. No. 594,597.

Patented Nov. 30, 1897.

19A, J. W

' v llNrrnD` STATESA PATENT @rrr-cn.

EDWARD ORSON BURROWS, OF SOMERVILLE, MASSACHUSETTS, ASSIGN OR TO THE SMITH da ANTHONY OOMPAN Y, OF BOSTON, MASSACHUSETTS.

HEATING AND VENTILATING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 594,597, dated November 30, 1897. Application led January 28,-1897. Serial No. 621,070. (No model.)

To all whom it may concern.'

Be it known that I, EDWARD ORsoN BUR' ROWS, of Somerville, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Heating and Ventilating Apparatus, of which the following is a specification.

This invention relates to apparatus for heating school-rooms and other apartments where heated airV is continuously supplied to the apartment or apartments to be heated, a corresponding volume of air being continuously Withdrawn from the apartment. In apartments which are not used at night it is desirable, for the sake of economy of heat, to return the air taken from the apartment back to the heater to be reheated and returned to the apartment; but when the apartment is occupied and a constant supply of air is needed it is desirable to expel the air taken from the apartment into the external atmosphere.

My invention has for its object to provide a simple and efficient heating and Ventilating apparatus adapted to attain the ends above mentioned; and it consists in the improvements which I will now proceed to describe and claim.

Of the accompanying drawings, forming a part of this specification, Figure l represents a perspective view showing portions of two apartments to be heated and ventilated and the application of my improved apparatus or circulating system thereto. Fig. 2 represents a section on line 2 2 of Fig. l. Fig. 3 represents a section on line 3 3 of Fig. l. Fig. yi represents a section on line 4 4 of Fig. 3. Fig. 5 represents a side elevation of the construction shown in Fig. l.

'The same letters of reference indicate the saine parts in all the gures. I

In the drawings, a represents a furnace or other heater, and h represents a chamber surrounding the same, which chamber receives the air which is heated and communicates, by means of uptake-nues c c,with the apartments d d to be heated and ventilated. The uptakefines c may be arranged to deliver air at any suitable point or points in the apartment, there being one uptake-flue c for each apartment.

e e represent vertical ventilating=flues,which communicate at their lower ends with a coldair chamber f and at their upper ends with the external atmosphere, there being one of the fines c for each apartment CZ. Each ventilating-flue communicates with the corresponding apartment through an opening g at or near the floor of the apartment, said opening having a suitable grating or register, as shown in Fig. l. Pivoted within each venti- 6o lating-fiue, at a point opposite the opening g,

is a damper h, which is formed to interrupt the continuity of the ilue and when in one position to connect the upper portion of the flue with the opening g, as shown in full lines in Fig. 2, the lower portion of the flue e being: thus shut off from the apartment. When the damper is in another position, as indicated by dotted lines in Fig. 2, it connects the opening g with the lower portion of the flue e and 7o shuts off the upper portion of said flue from communication with the apartment. VIt will be seen, therefore, that when the damper h is in the position shown in full lines it connects the ventilation-opening g with the external air through the upper portion of the Ventilating-line, and when in the position shownin dotted lines it connects said opening with the air-chamber f through the lower portion of the Ventilating-liuc. The air-cham- 8o ber f communicates, through passages awith the hot-air chamber b, surroundin g the heater,

so that air admitted to said chamber passes to the hot-air chamber and is heated and returns to the apartment through the uptakeiiues c c.

The operation is as follows; Vhen it is desired to both heat and ventilate the apartment (l, the damper h is adjusted as shown in full lines in Fig. 2, so that the vitiated air 9o from the lower portion of the room is drawn upwardly through the Ventilating-flue and escapes into the open air, a constant supply of warmed fresh 'air being introduced into the apartment through the corresponding uptake c. When it is desired to simply keep the apartment d warm, without particular regard for ventilation, as during the night, the damper h is adjusted as shown in dotted lines in Fig. 2 and causes the air Withdrawn Ico through the Yopening g to pass downwardlyv into the air-chamberf, from whence it enters the hot-air chamber b, to be there heated and returned to the apartment d through the uptake c. The air-chamber f is provided with a suitable fresh-air inlet which is closed when the damper It is adjusted to permit the return of air from the apartment (l to the airehamber and is opened when the damper is adj usted to permit the air from the apartment d to escape into the external air.

The damper h is preferably made of concave-convex form in cross-section, so that it presents a curved surface to the current of air issuing from the apartment through the opening and detlects said current either upwardly or downwardly, according to the adjustment of the damper, at an easy curve, reducing friction to the minimum and therefore facilitating the escape of air from the apartment. The damper is preferably mounted upon a spindle 7L', which is supported in suitable bearings in the walls of the flue e, the axis of the spindle being at the center of a chord of the arc, or at a distance from the concave side. Therefore gravity causes the damper to normally assume the position shown by full lines in Fig. 2. For the purpose of adjusting the damper 7L in opposition toits gravity I provide a chain h2, which is connected to the upper edge of the damper and extends forward through a suitable guide in the grating covering the opening g. A suitable catch may be provided on said grating to hold the chain when the damper is in the dotted-line adjustment shown in Fig. 2, or the friction of the chain in said guide may serve this purpose. XYhen the chain is released, the damper assumes the fullline position shown in Fig. 2 by gravitation.

I claim- 1. A heating and vVentilating apparatus or system, comprising an air-heating chamber, an uptake connecting said chamber with an apartment to be heated, a cold-air chamber communicating with the heating-chamber, a Ventilating-flue connected at one end with the cold-air chamber and at the other end with the external air, and communicating at an intermediate point with the apartment through a ventilation-opening, and a damper in said flue adjacent to said opening and subdividing the Ventilating-flue into two sections and adapted to direct air from the apartment upward through the upper section to the external air, or downward through the lower section to the cold-air chamber.

2. The combination with a ventilating-lue having an opening which connects it with an apartment to be ventilated, of a damper pivoted in the flue at a point opposite the opening and curved in cross-section, the pivot of the damper being at a distance from the ecnter of its concave side, said damper being arranged to gravitate to connect the upper portion of the ilue with said opening and provided with means for positively holding it in opposition toits gravity to connect the lower portion of said [lue with the opening.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 25th day of January, A. D. 1806.

EDVARD ORSON BURROWS.

\Vitnesses:

A. D. HARRISON, l. NV. PEZZETTI. 

